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I do not recommend omni directional antennas often.
However because of your past use omnidirectional antenna and you understand the limitations of a omnidirectional antenna and because of the moderate to strong signal strengths of the Tv stations in all directions around your location.
For your consideration.
I recommend Test the reception at your location with a ,
www.antennacraft.net ,
HD View 360 .
The HD View 360 , will receive in all directions with no rotation and the HD View 360 has the ability to rotate to aim directly at Tv transmitter for better reception.
Antennacraft says the rotation is very fast so channel surfing is easy.
And channels can be programmed in to the unit with the remote control so the antenna rotates directly to the correct aim position.
http://www.antennacraft.net/Antennas...Amplified.html
Also for your consideration , the , 5MS921 Omni-State , Omni Directional Antenna.
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No matter what antenna you choose.
Replace the outside coax with NEW Coax that has the Compression type connectors on the ends of the coax help keep weather water out of coax and outside connections , replace outside connections , even if they do not look bad.
Do not use coax that have the crimp type connectors on the ends of the new coax.